I am having issues with members of another forum coming to mine to cause problems. Now I wrote one of the Adminstrators with screen shots of porn that these people have posted on my site and it seems like nothing was done to them. They keeping coming and posting things in the report a forum saying I have porn on my site which I do not. What can be done? Please contact me via pm and I'll gladly give the name of the forum causing problems.

All you can do is to ban and ban them repeatedly and clean the mess, once you do that, they won't have any evidence that the forum has porn contents, if they are going back, keep repeating what i suggested above, if you need more moderators for the security of the forum, then you can add more, those are spammers who are trying to destroy a reputation of a forum.. right now, you can only protect your forum by what i suggested above.